Good paperwork and good chemistry fool different people
Everyone has a channel they trust, and it is the channel they get taken on. Knowing which one is yours is most of the defence.
Deal structuring
2 pieces on this.
The cheapest thing that qualifies is usually the worst value
When a rule sets a price floor, the item priced exactly at the floor is the one most likely to be overpriced. A pricing distortion most buyers never see, and what it costs them.